Write and solve an algebraic equation to find the original mass of a sample of the radioactive isotope uranium-235, which has a half-life of 704 million years. Your sample is about 700 million years old and has a mass of 120 g.

Question

anonymous · Answer

@phi can you please help me with this??

anonymous · Answer

So A=Asub 0 * (1/2)^t/h

you need to find Asub0

A= Final amount
A=Initial Amount
t=time
h=half life

anonymous · Answer

So plug in the numbers:

120g=Asub0*(1/2)^(700000000/704000000)